"JOURNAL OF RADIO ELECTRONICS" (Zhurnal Radioelektroniki ISSN 1684-1719, N 2, 2018

contents of issue      DOI  10.30898/1684-1719.2018.2.5       full text in Russian (pdf) 



V. S. Sherbakov


34 Gorkogo str., city of Balakhna 8, Nizhniy Novgorod region, 606408, Russia


The paper is received on February 16, 2018


Abstract. The principles of processing superposition of reflected super-wide-band LFM signals by a correlation-filtering method are considered. As a result, the compressed over the distance chirp signals are transformed in a spatial «window» and their frequencies are shifted proportionally. In this case, the frequency band of the reflected signals narrows in proportion to the transformation coefficient, so that further processing can be performed in digital form. This ensure high stability and identity of the processed signals necessary for more reliable recognition of radar targets with allowance for over-resolution by distance. A method for compensating frequency detunings, compressed and frequency-shifted superpositions of reflected chirp signals, is proposed, which makes it possible to carry out their weight processing by standard methods and to limit the spectral band. Thus, the signal-to-noise ratio is increased, and the correlation-filtering method, taking into account the compensation of frequency detunings of the transformed and compressed chirp signals, approaches the optimal modus. This makes it possible to provide detection at longer distances, about 0.8 times the maximum detection, and, if necessary, take appropriate measures. It is shown that, regardless of the spatial "window" size, energy losses remain minimal, and the frequency of discrete samples of compressed pulses decreases in proportion to the transformation coefficient, while providing high resolution and maintaining phase information about the "brilliant" points in the spatial "portrait". In addition, the correlation-filter path characteristics dependence is determined: the deviation and duration of the main and auxiliary heterodynes, as well as the compressing filter spectral characteristics from the parameters of the spatial "window", the distance resolution and the coefficient of transformation.

Keywords: radar, recognition, correlation-filteingr method, frequency-time transformation, weight processing.


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For citation:

V. S. Sherbakov. Correlation-filtering method for processing of high -frequency LFM signals. Zhurnal Radioelektroniki - Journal of Radio Electronics. 2018. No. 2. Available at http://jre.cplire.ru/jre/feb18/11/text.pdf
DOI  10.30898/1684-1719.2018.2.5